Two-way roll-over disc plow



Jan. 15, `1957 HQA. PuRscHE TWO-WAY ROLL-OVER DISC PLOW Filed oet. 31, 195,2

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' Two-WAY ROLL-OVER DISC PLOW Filed Oct. 3l, 1952 5 Sheets-Sheet 2 Jan. 15, 1957 H. A. PURSCHE TWO-WAY ROLL-OVER DISC PLOW Filed o ct. s1. 1952 5 Sheets-Sheet 3 JNVENTOR. /47 Haze# ,cz paese/Lf BY @a Jan. 15, 1957 H. A. PuRscHr-z 2,777,373

Two-WAY ROLL-OVER DISC PLow 'Filedoot. s1, 1952 5 sheets-sheet 4 .Wu l i IN1/EN TOR. #Heey 1Q. aescf/E @Uma/EVS Jan. 15, 1957 H. A. PURSCHE TWO-WAY ROLL-OVER DISC PLOW Filed Oct. 3l. 1952 l5/6.19. Y Y

@Woe/JEVS United States Patent O TWO-WAY ROLL-OVER DISC PLOW Harry A. Pursche, Gardena, Calif.

Application October 31, 19.52, Serial.No. 318,051

This invention relates to agricultural implements and is particularly directedv to improvementsin a two-way disc plow. My inventionwill' be described .in connection with a two-way disc plow having a roll-.over carrier mounted to turn about an axis. extending longitudinally to the direction of travel of the plow.

Two-way plows are capable of throwing a furrow either to the left or to the` right as desired. and therefore they are used extensively on. land which must be kept level or nearly level for irrigation purposes, as well as on hilly land where contour plowing is preferable. Disc plows have certain advantages over moldboard plows as will' b'e understood by those skilled in the art. Amongthese is the characteristic advantage that. the disc plow requires less draw-bar horsepower to operate it.

Two-way disc plows however have not met. wtihluniversal acceptance and this is atleast partly! due to the construction heretofore adopted in which, the. individual discs each function both as a right-hand plow anda lefthand plow. In such devices the discs are mounted' on a beam which swings from side to side. In one position of the beam the plow discsy producesa right-hand furrow and in the other position of the beam the same discs produce a left-hand furrow. Two-way disc plow devices of this ytype are relatively inflexible because they cannot readily be adjusted for a wide range of depth of furrow as well as a wide range effective plowing width..

In accordance with my invention I provide. a. plow carrier which is mounted to turn' about a longitudinal' axis and on this `carrier I position a plurality of discs for righthand use and a plurality of. discs for left-hand' use'. The number of discs employed may bevaried.` The effective width to be plowed may be varied by changing the number of discs and by adjusting the position of each ofthe discs along the length'of the carrier. The depth of cut and the angularity of the individual. discs may be regulated as desired. Furthermore I provide means for absorbing the lateral side thrust which'is characteristically developed by disc plows, and the side thrustabsorbing elements are also adjustably mounted on the plow carrier.l I prefer to provide separate means for regulating' the depth of cut and this means takes theforrn of a novel tail wheel assembly mounted to roll on unplowed ground Other and more detailed objects and advantages will appear hereinafter.

Referring to the drawings:

Figure l is a side elevation partly' broken away showing in idealized form a preferred embodiment of' my invention.

Figure 2 is a plan viewl taken substantially on thev lines 2-2 as shown inFigure 1.

Figure 3 is a perspective view showingl details of'construction of the roll-over carrier.

Figure 4 is a rear elevation showing-the discs in` operative position for producing a right-hand' furrow.

Figure 5 is a4 fragmentary rear elevationiishowingone of the supporting wheelsl rolling-.in the furrowandish'owing the horizontal position of the plowcarrier.

2,7FWl Patented Jain. l5, 1957 ICC Figure Y6 is asectional'elevation taken substantially on the lines 6/-6 'as shown inFigure 2.

Figure 7` is a sectional plan view partly broken away showing the left-hand'poition of Figure 2 on an enlarged scale.

Figure 81 is a f'ragmental detail showingan end View of the device and illustrating, a portion. of the tail wheel assembly in a different position than that of Figurek 4.

Figure 9v is a sectional detail taken, substantially on. the lines 9'-9'as shown in Figure l.,

Figure 10 is ai sectionalelevationV taken substantially on the lines lll-lil as shown in Figure 14 lookingv along the beamI 51, andr showing` details. of. the. construction of the carrier'.

Figure l-l is a fragmentary detail showing the mounting ,and adjustment of one of the. plow discs relative to the carrier..

Figure, 12 is a. sectional` plan4 View partly broken away taken` substantially on. the lines. 12-12 asshownin Figure Il..

Figure.. 13 is a perspective View showing the construction. of one-of the plow beams.

Figure i4 isa detail partly in section showing the connection between the plow beam and thebearing housing for one of the' plow discs.

Figure l5 is aperspective view showing one of the wedges. which may be, employed to'L cant the discV bearing housing with respectto the plow beam.

Figure 16j is a: View similar to FigureA l2 showing the use of the wedge.

Figure' 17 is arear elevation partly broken` away showing; the mechanism `for rolling theplow carrier relative to the stationaryl longitudinal beam as well as details of the mechanism for latching the carrier in either of its operative positions.

Figure 18 is al plany view partly broken away showing thev mechanism for rolling the carrier and for latching it ink place; Figure 119 is a fragmentary detail partly in section showing thelatchf mechanism for the carrier. Figure 20' is aperspective view of the latch-operating fitting. Figure 2l is an end view showing details of operation of the tail wheelassembly. Figure 22 is a View similar toFi'gure- 67 showing a modified form of tail wheel assembly. Figure :23 is `a plany view of the device shown in Figure 22.. Figure 24 is a View similar to Figure 3-showing a modified form of frame and carrier-- Referring; to the. drawings.:

The mobile frameA generally designatedy 10 includes parallel side members 114 andv 12 joined by a curved front member 1-3 anda straight rear member 14; The frame 10 may be raisedand. lowered relative to the ground' Wheels 15- and.16 by means of hydraulic power cylinder assemblies-1.7, acting'onthe'wheel' arms 181 and 19'. The frame 10 includes ay stationarylongitudinal beam 20y which extends centrally of the frame between the side members 151 and l2 andvwhich"isiixedI to ther front and rear members 13and 14. This longitudinal beam 26) projects rearwardly from the frarnelll to provide a support for the plow cartier 2l.

A. tongue member'22 ispivoted` to the beam 20 atv 23. This tongue member is bifurcated, with the upper legy 24 and lower legt 25 straddling the curved front member 13 andthe beam 2li. Rollers' 2'6. may be 4provided to permit the tongue member 22 to roll' on the curved front member 13. The tongue member 22 includes thel draft part 27 which is pivoted at 28` and provided with. a draft coupling 29 at its forward end.- The extent of pivotal movement ofthe draft part 27 may be limited by means of pinsl projected-.through aligned openings 30.

Means are providedfor shifting and latchi-ng the tongue member 22 and: as show-n in' the-drawings this means includes. the hydraulic cylinder assembly 31 pivotally con-Y 3 nected at 32 to the crossbar 33. The piston rod 34 is connected to the bracket fixed on the lower leg 25 of the tongue member 22. The crossbar 33 is itself pivoted to the beam 20 at 36 and the extent of its pivotal movement is limited by the stops 37 and 38 on the frame side member 12. When the hydraulic cylinder assembly 31 is energized to retract the piston rod 34, the tongue member 22 is shifted in a clockwise direction about its pivot 23, as viewed in Figure 2. Similarly, the tongue member is swung in the other direction when the cylinder assembly 31 projects the piston rod 34.

Movement of the crossbar 33 is utilized to actuate the tongue latches 39 and 4l). Each of these latches is pivoted on the curved member 13 of the frame and is adapted to latch the tongue member 22 in one of its two operative positions. Thus, the shoulder 41 engages one side surface 42 of the tongue member 22 and the corresponding shoulder on latch engages the other side surface 42 thereof. Actuating rods 44 are pivoted to the latches 39 and 40, respectively, and pass loosely through blocks 45 pivoted to the crossbar 33. Compression springs 46 encircling the rods 44 tend to swing the latches toward operative position, whereas the rods serve to retract the latches against the action of the springs. The latches 39 and 40 relieve the hydraulic cylinder assembly 31 of the requirement of holding the tongue member 22 in either of its operative positions.

The carrier 21 includes a support pipe 47 mounted to turn on the overhanging portion of the longitudinal beam 20. The support pipe 47 extends between the parallel tracks 48 and 49 which are mounted at an angle to the pipe 47. Each of these tracks is formed by a pair of angle irons 50 iixed, as by welding, to the flanges of the central I beam support 51. The parallel parts of each pair of angle irons 50 dene the track between them, and these parallel parts are provided with a series of aligned, closely spaced apertures 52. The pipe 47 extends through the I beam support 51 at an angle, and the adjacent parts at the intersection are welded together. A front strut 53 and a rear strut 54 connect the ends of the I beam to the pipe 47 to provide a rigid structure. A thrust collar 55 is removably fixed to the rearward end of the longitudinal beam 20 and engages a thrust surface on the rear end of the pipe 47 to apply the draft force to the carrier 21.

A tirst gang of plow discs 57 is carried by the track 48 and a second gang of plow discs 58 is carried by the track 49. A support beam 59 is provided for each disc. Each support beam is generally L-shaped and the horizontal portion is provided with a plurality of apertures 60 having the same spacing as the track apertures 52. Each support beam 59 may be moved to any desired position along its respective track, and then secured in place by fastening elements 61 extending through aligned apertures 52 and 60. The vertical portion of each support beam 59 is received within a socket 62 on a bearing housing 63. Each disc is rotatably supported on one of these bearing housings. Angular adjustment in one plane between each support beam 59 and its respective bearing housing 63 is provided by the pivot bolt 64, clamp bolt 65 and set screws 65a, and angular adjustment in another plane is provided by the apertured wedges 66. The wedges 66 may be mounted within the sockets 62 to cant the bearing housing 63 and disc in either direction, as desired.

Means are provided for turning the carrier 21 relative to the frame 10 to bring either gang of discs into plowing position. As shown in the drawings this means includes a double-acting hydraulic cylinder assembly 67 having piston rods 68 and 69 projecting from opposite ends thereof and carrying sheaves 70 and 71, respectively. A cable 72 has a plurality of loops encircling the drum 73 which is iixed on the forward end of the carrier pipe 47. The cable passes over the sheaves 70 and 71 and its two ends 74 and 75 are fixed to the rocking anchor part 76. This part 76 is supported on the frame 10 and as shown in Figure 20 is provided with a pair of legs 77 and 78 and a central pivot hole 79. An upstanding post 80 has holes 81 affording connection for the fittings at the ends 74 and 75 of the cable 72. An upstanding stationary bracket 82 on the frame cross member 14 is rounded at its upper end 83 for reception within the recess 84 in the rocking anchor part 76. A pin 85 passes through the bracket 82 and pivot hole 79 to prevent separation of the parts. The legs 77 and 78 engage the sides of the bracket 82 to limit rocking movement of the element 76 in each direction.

The rocking anchor part 76 is provided with apertured lugs 86 which afford a pivotal connection with the rods 87 and 88. The lower end of each push rod passes loosely through an opening in a block 89 pivotally attached to a crank arm 90. Each crank arm 90 is fixed to a rock shaft 91 supported in spaced bearings 92. Latches 93 and 94 are fixed to their respective shafts 91. A compression spring 95 encircles a portion of each rod and is confined between 'a stop collar 95a and one of thc blocks 89. A second stop collar engages the block 89 directly.

Stationary abutrnents 96 and 97 are fixed on the frame 10 and are adapted to be engaged by the stop elements 98 and 99 mounted on the carrier 21 at the forward end of the parallel tracks 48 and 49. These stop elements may conveniently take the form of bolts threaded into opposite ends of an internally threaded boss 19). The bolt head of the stop element 99 engages the stationary abutment 97 and is held in this position by the latch 94. Similarly, the bolt head of the stop element 98 engages the stationary abutment 96 and is held in this position by the latch 93.

When the hydraulic cylinder assembly 67 is energized to project the piston rod 68 and retract the piston rod 69, the cable 72 is tensioned to turn the drum 73 in a direction to bring the stop 99 against the abutment 97. The tension in the end 74 of the cable 72 causes the element 76 to rock to the position shown in Figure I7, thereby tensioning the rod 87 and moving the latch 93 to released position, permitting the carrier to tur'n. As the stop 99 approaches the abutment 97 it strikes the tapered surface 101 on the nose of the latch 94, causing the latch 94, rock shaft 91 and crank arm 90 to move the block 89 against the action of the compression spring 95 on rod 88. The spring then returns the latch 94 to operative position. Similarly, when the hydraulic cylinder assembly 67 is energized to project the piston rod 69 yand retract the piston rod 63, the cable 72 is tensioned to turn the drum 73 in a direction to bring the stop 98 lagainst the abutment 96. The tension` in the end 75 of the cable causes the element 76 to shift away from the position shown in Figure 17, thereby tensioning the rod 88 to move the latch 94 to released position, permitting the carrier to turn. Engagement of the stop 98 with the tapered surface 102 swings the latch 93 momentarily against the action of the spring 95 on rod 87 to allow the stop 98 to reach the abutment 96. The latch 93 is returned to latching position by the action of thc spring 95 on rod 87.

It will be observed that the carrier 21 turns somewhat less than one-half revolution because they frame 10 tiltsl as the wheels 15 and 16 alternately roll in the furrow. (See Figure 5.) The carrier tracks 48 and 49 remain horizontal, however, so that all of the plow discs in each gang cut to the same depth.

I prefer to provide .a third supporting wheel 193 which is mounted on the carrier 21 and which rolls on nnplowed ground. The plow assembly is thus provided with three-point suspension and hence is not affected by relative vertical movement of the tractor as it mort-i; over uneven ground. This third wheel 163 is carried at the swinging end of an arm 104. A pivot bolt connects the arm 104 to the support bracket 196 iixcd to the rearward portion of the carrier I beam 5l. As

show-nin Fi'g-urefhtheV bracket 106 is mndesupf of a short;- part- 107 and. along. part. 108iv welded to.N the. L beam 5.1.k Astop? element 1110-isited to,v the arm 104andt is providedwith stop shoulders 111 and` 11.2. Theseshoulv ders 111 and4 112.` prevent over-travelrof the-farmi. 104 with respect tothe bracket 106 by engagementy with the part 108.

A11 Iarcuate segmentr113 is fixed-to the, arm 104y and isprovided with a: seriest lofrapertures- 114-whichs may be utilized forrbolting the blocks'115f'and116tto-the segment 113. The block 1-15 provides air-abutment for engagement with/the end surface' 117 on`-the pivoted stop lug 118 Similarly, the block ll'provideswan abutment for engagementwiththe end surface'119; of the stop lug- 118; Thestop lugl 118 is supported 'one pivotfpin 1f18a=mounted on the carrier 21 near the juncture of the IV beam 5^1-` and the part 108r of the bracket 106. Meansare provided for shifting the positionof the stop lug 118 in accordance withftheposition of the carrier 21= so that theI stop lug 118l will engagel the* uppermost of the b1ocksr115 andv 116 Asl shownrin Figure 4and.the: full lines. in Figure21 the end-.surface11.7 of. the stop lug 1.18l engages the block 1215'v when thecarrier 21- is'in position to produce Iaright-handl furrow'. When the carrier 21 is shifted to. the dashed. line position-shown nFigure. 2l the tend surface 1'19- of thefstcp lugl 118- eng-ages the block 116.. Inheach oasetthe`stop1lug 118 engagesthe uppermost ofthe'blocks 115 and 116: TheA purposey of this arrangementis. toy permitt'he use: of a smaller ydiameter tail wheel-Y. 103: than wouldothenwise be possible, and yet provide' av full; range tif-.adjustment forthe depthf of cut of the discs.

The thrust carrier 55 at the"y rear end of the: longitudinal beam 20 is providedwith a protuberancef 1201 atone side. for engagement with they follower roller 121. This roller 121 is supported ony a clevis122'iixed on'the endrof a slide rod 123. This? rod: 123Y passes: through'ar guide sleeve 124Hixed tothe strut 54.-A A. compnession spring 125 is interposed between this; sleeve: 1:24 and the Iclevis 122 in order to' maintain. the roller 121in contact with the protuberance- 120 :or outercylindrical surface 126v of the thrust collar 55; A block 127 is slidablyI mounted onY the rod 1123-and-rconiined between compression springs 128- and nuts l129 which serve vkas'abutmentS. The springs 128 tend tol keep the blockf127- centeredv between the abutments 129. A link 130 ispivotally con-4 nected at one end to: the stop lug11-18v-andl at thewother end to the block 127. When the carrier 21.` and strut 54 turn in ay oounterclockwise: direct-ioni as'vviewed in: Figure 2l,A the roller 121 rides rdownatheprotuberance' 120.- and engages the cylindrical surface-126z-- The rod 123v i moves radially inwardly between. the longitudinal ble-am 20 .andthis action causes the link 1'30rto-shiftj the: posi'- tion of the stop lug 118 about itspivohal: suppoit 118:1;y The stop lug 118i then assumes the positionshown in the dashed lines in Figure 2l.l Bumper: blocks 131 and 132 may be mounted on the strut v54 to limit theextent of pivotal movement Iof stop lug 118.

The frame ofbeam 20' and'. carrier'Zlrare' raised to bringfthe plow discs out of the ground andthe carrier 21 is subsequently turnedin the direction' of the arrows shown in Figure 21. Thetail wheel- 103T restszonftheY ground until the part 108 of the bracket 106 'engagesunder theshoulder 111 andy thev tail wheel 103'k is lft'edf clear'r of the. ground. When'. thel carrier 21 is turned about thebearn'f20; the'tail wheel 103 swings underl the beam 20; just clearing the ground. As the strut 54 approaches: thei dashed"4 line position shown in Figure 21 th'ezarrn"` 1042and1'wh`eel' 103 drop by gravity and the blocks 115 and116 lratchet past the inclined' surface 133 ofthe'stop'lug 118; The` spring mounting of the,` slide'v block 12F/*permits the. stop lug,l 1:18 to swing about itszpivotal support ytoipermit theblo'cks 115 and 1-16 to pass byf. The stop shoulder 11`2may'engage the part 108to1imit downwardtmovementof the arm 104 and wheel 103. When the strut 54 reaches the horizontal pusition-shownfindashed lines. in Figurey 21, the. Wheel 103 rests ontheground-and the shoulders 111 and 112 have clearance in respect toA thev part 108. The surface 119 of the stop lug-118 engages theV abutment on the biock 116- to` hold the tail wheel assembly in position.

Similarly, when the carrier 21 is to be turned in a clockwise" direction as viewed in: Figure 2l, the beam 202 and carrier 21 are first raised to lift the plow discs clear of the ground, thereby causing the shoulder 112 to engage the part 108 and raise the tail wheel 103 as thev carrier turns. The strut 54 then :swings downwardly about the axis of the pipe 20,v the strut 54 approaches the full-line position shown in Figure 2l, and the roller 122 rides up on the protuberance 120andswings' the pivoted stop lug 118 to the position shown in full" lines with respect to the strut 54. The arm 104 and wheel 103 descend byV gravity and the blocks 115 and 1-16 slide past: the inclined surface' 1-33 on the' stop lug 118. The sliding` block 127 permits the stop lug 118 to swingfl about its supportllla sufciently to allow'the blocks-115 and 116 to pass. The clockwise motion of thefcarrier. 21 andstrut 54, ceases when the surface 117 of the stop lug 118-engages the abutment provided by the block. 115.

Means are provided for absorbing the lateral thrust of the' plow discs. This` means comprises the furrow wheels 144 and 145 which are tilted to an angle well suited'. to prevent side movement in the furrow. Each furrow wheel is rotatably mounted at the end of a preformed support shank 146,147. Theshanks are received within the tracks 48- and '49'l andare adjustably iixed along the' length thereof.. The `Shanks-146 and'147 are attached to the tracks-48,` 49in a position tofplace theV furrow wheel in the proper location behindthe last plow disc 57, 50 in the gang.

WhileIhave'shown four plow discsfin each gang it will be-understood that al greater or lesser'nurnber canA be employed. Thetracks 48-and 49 permit the discs 1and furrow wheels torbevaried in number and in spacing.

In the modified form-'of'my invention shown in Figures 22" andfL 23, I= provide hydraulically actuatedY mechanism for swinging the stop lugy 118e about its pivotal support 134. Thearm` 10411, segment 113a and tail wheel 103a are substantially the same-as previously described. The slide rod 12341 passesthrough the guide sleeve'124a and is connected for-actuation by the double-acting power cylinder assembly 135. .Theus'lide block 127:1 and link 130e function in substantially the same manner as described above. When hydraulic uid under pressure is admitted through line 136 and exhausted through line 137, the stoplug' 113cv is caused to swing from the position shown in Figure-22 to a position corresponding to the dashed line position shown in Figure 2l.` Conversely, when hydraulic fluid under pressure is admitted through line 137V and exhausted through line 1136` the' stop lug 118e: is returned4 to the posi'- tionshown in Figure 22. `The endl surfaces 117afand 11% of the stop lug1`18a engage the abutments provided by.

the blocks 115e andv 11651, respectively, as described above.

The'hydraulic lines 136 and 13'7 may be interconnected with the hydraulic lines`1'38 and 139, respectively (see Figure. 18) which serve the double-acting power cylinder assembly 67. Thus, whenl the power cylinder assembly 67 is actuated in a directionV to turn the carrier to the position shown in Figurey 4', the stop lug 118e is caused to shiftto the-position shown inFigure 22. Similarly, when the carrier 21 is' shifted to a position to produce a lefthand furrow,` the stop lug 11851 is also shifted. The hydraulic lines136 and 137 may conveniently be extended through the interior of the longitudinal member 20 and connected to the lines 138 and139 at a position7 on the framek 10 in advance-of thecarrier 21, or, if desired, these hydrauliclines maybe positioned between the flangesv of the I-beam S1 and attached to the forward strut S3 on*l the carrier 21'.

In themodied form of my invention shown* iny Figure 24,.th'e'longit'udinal bearny member 20]:Y is shortened so that it projects rearwardly from' the frame 10b for adistance equal to substantially half the length of the carrier 2lb. Like Figure 3, Figure 24 shows the carrier 2lb only partially installed on the beam h. Further telescopic movement of the carrier 2lb toward frame 10b serves to cause a portion of the beam 2Gb to project beyond the rear end of the tube 47b. A thrust collar SSb which is substantially the same as that illustrated at 55 in Figure 2l, but omitting protuberance 126, is then connected to the rear end of the beam 20b in position to contact the rear end of the tube 47b. The carrier rails 43.5 and 49b are substantially the same as previously described. The bracket 116b on the rear projecting end of the carrier 2lb supports a tail wheel assembly, not shown. The tail wheel assembly is preferably of the hydraulically actuated type shown in Figures 22 and 23. The frame 1Gb differs from the frame 1t) previously described in that the arms for the side supporting wheels are both fixed to a single cross shaft 140 instead of being independently mounted on separate shafts 141 and 142 as shown in Figure 3. The wheel arms are actuated in the same manner previously described but the wheels move up and down together with respect to the frame 1@ instead of being capable of independent movement. lt will be apparent that the carrier 21 can be telescopically removed from the longitudinal beam member 2G upon disconnection of the thrust collar. Other earth-working tools may then be mounted on the rearwardly projecting portion of the beam 2Gb and held in place by the thrust collar.

In operation, the plow device is towed to the eld with the carrier 21 in raised position. The carrier is lowered to bring one of the plow gangs into plowing position. The depth of cut is controlled by the setting of the tail wheel stops 115 and 116 and the adjusting screws 14S which engage the wheel arms 18 and 19. The tongue member 22 is shifted to position the plow device in proper lateral position behind the tractor. At the end of the furrow the lift cylinders 17 are actuated to raise the frame 10 and carrier 21. The tractor and plow are then turned around at the end of the field, and during this movement the tongue is shifted and the carrier 21 is turned over to bring the other plow gang into position. Hydraulic pressure in the lift cylinders 17 is then relaxed to allow the plow discs to enter the ground. The ground wheels 1S and 16 roll alternately in the furrow, while the third wheel 103 always rolls on unplowed ground.

Having fully described my invention, it is to be understood that I do not wish to be limited to the details herein set forth, but my invention is of the full scope of the appended claims.

l claim:

l. In a two-way plow assembly, the combination of: a frame, a carrier tnrnably mounted on the frame and provided, with ground-engaging plow means for producing a right-hand furrow or a left-hand furrow, means on the frame whereby it may be raised to lift the carrier and plow means clear of the ground, independent means for turning the carrier to either of two operative positions relative to the frame to cause the plow means to produce a right-hand furrow or a left-hand furrow as desired, said means including a flexible tension element operatively connected to turn the carrier, a part movably mounted on the frame and having at least one end of the flexible tension element secured relative thereto, power means for shifting the tlexible tension element to turn the carrier, latch means on the frame engagcable with an element on the carrier for latching the carrier in at least one of its operative positions, and linkage means operatively connecting the latch means and said part whereby movement of said part under forces imparted by the end of the flexible tension element serves to actuate said latch means.

2. In a two-way plow assembly, the combination of: a frame, a carrier turnably mounted on the frame and provided with ground-engaging plow means for producing a right-hand furrow or a left-hand furrow, means on the frame whereby it may be raised to lift the carrier and plow means clear of the ground, independent means for turning the carrier to either of two operative positions relative to the frame to cause the plow means to produce a right-hand furrow or a left-hand furrow as desired, said means including a drum on the carrier, a cable reeved on the drum between the ends thereof, a part movably mounted on the frame and having the ends of the cable secured relative thereto, power means for shifting the cable to turn the drum and carrier, latch means on the frame engageable with an element on the carrier for latching the carrier in either of its operative positions, and linkage means operatively connecting the latch means and said part whereby movement of said part under forces imparted by the ends of the cable serves to actuate said latch means.

3. In a two-way plow assembly, the combination of: a frame, a stationary longitudinal beam fixed on the frame and extending rearwardly therefrom, a carrier turnably mounted on the beam and provided with groundengaging plow means for producing a right-hand furrow or a left-hand furrow, means on the frame whereby it may be raised to lift the carrier and plow means clear of the ground, independent means for turning the carrier to either of two operative positions relative to the frame to cause the plow means to produce a right-hand furrow or a left-hand furrow as desired, said means including a drum on the carrier, a cable reeved on the drum between the ends thereof, a part movably mounted on the frame and having the ends of the cable secured relative thereto, power means for shifting the cable to turn the drum and carrier including a double ended hydraulic power cylinder having piston rods projecting from opposed ends thereof, a sheave on each piston rod engaging the cable, latch means on the frame engageable with an element on the carrier for latching the carrier in either of its operative positions, and linkage means operatively connecting said part to said latch means whereby movement of said part under forces imparted by the ends of the cable serves to actuate said latch means.

4. In a two-way plow assembly, the combination of: a frame, a longitudinal beam member on the frame projecting rearwardly therefrom, a carrier mounted for turning movement on said beam member, ground-engaging plow means on the carrier for producing either a righthand furrow or a left-hand furrow, means whereby the carrier may be turned relative to the beam member to either of two operative positions to produce a right-hand furrow or a left-hand furrow as desired, a tail wheel assembly on the carrier including a wheel adapted to roll on unplowed ground in either operative position of the carrier, said assembly having cooperating parts limiting downward movement of the carrier relative to said wheel, said assembly also including means engaging an element on said beam member rearwardly of said carrier and actuated in accordance with the position of the carrier for moving one of said cooperating parts to an inoperative position.

5. In a two-way plow assembly, the combination of: a frame, a longitudinal beam member on the frame projecting rearwardly therefrom, a carrier mounted for turning movement on said beam member, ground-engaging plow means on the carrier for producing either a righthand furrow or a left-hand furrow, means whereby the carrier may be turned relative to the beam member to either of two operative positions to produce a right-hand furrow or a left-hand furrow as desired, an arm pivoted on the carrier and carrying a wheel adapted to roll on unplowed ground in either operative position of the carrier, cooperating parts limiting downward movement of the carrier relative to said arm, and means engaging an element on said beam member rearwardly of said carrier and actuated in accordance with the position of the carrier for moving one of said cooperating parts to an inoperative position.

6. In a two-wail plow assembly, the combination of: a frame, a longitudinal beam member on the frame projecting rearwardly therefrom, a carrier mounted for turning movement on said beam member, ground-engaging plow means on the carrier for producing either a righthand furrow or a left-hand furrow, means whereby the carrier may be turned relative to the beam member to either of two operative positions to produce a right-hand furrow or a left-hand furrow as desired, an arm pivoted on the carrier, a wheel on the swinging end of the arm adapted to roll on unplowed ground in either operative position of the carrier, cooperating parts for maintaining the wheel axis below the pivotal axis of the arm, and means engaging an element on said beam member rearwardly of said carrier and actuated in accordance with the position of the carrier for moving one of said cooperating parts to an inoperative position.

7. In a two-way plow assembly, the combination of: a frame having supporting wheels at the sides thereof, a longitudinal beam member on the frame projecting rearwardly therefrom, a carrier mounted for turning movement on said beam member, groundengaging plow means on the carrier for producing either a right-hand furrow or a left-hand furrow, means whereby the carrier may be turned relative to the beam member to either of two operative positions to produce a right-hand furrow or a left-hand furrow as desired, an arm pivoted on the carrier, a wheel on the swinging end of the arm, said wheel being adapted to roll on unplowed ground in either operative position of the carrier and to cooperate with the rst said wheels for supporting the plow assembly, cooperating parts for maintaining the wheel axis below the pivotal axis of the arm, and means engaging an element on said beam member rearwardly of said carrier and actuated in accordance with the position of the carrier for moving one of said cooperating parts to an inoperative position.

8. In a two-way plow assembly, the combination of: a frame, a longitudinal beam member on the frame projecting rearwardly therefrom, a carrier turnably mounted on the projecting portion of the beam member, a thrust collar removably fixed on the rear end of the beam member and engaging the rear end of said carrier, groundengaging means on the carrier for producing either a right-hand furrow or left-hand furrow, means whereby the carrier may be turned relative to the frame to either of two operative positions to produce a right-hand furrow or a left-hand furrow as desired, a tail wheel assembly mounted on the carrier, said assembly including a wheel movably mounted upon the carrier and adapted to roll on unplowed ground in either operative position of the carrier, cooperating parts limiting downward movement of the carrier relative to said wheel, and means including an element on the thrust collar for moving one of the cooperating parts to an inoperative position in accordance with the position of the carrier.

9. In a two-way plow assembly, the combination of: a frame, a carrier turnably mounted on the frame and having ground-engaging plow means for producing either a right-hand furrow or a left-hand furrow, an arm pivoted on the carrier, a wheel on the swinging end of the arm adapted to roll on unplowed ground, a pair of spaced abutments xed relative to the arm, a stop lug pivotally mounted on the carrier and having opposed ends each engageable with one of said abutments, the abutments and stop lug cooperating to maintain the wheel axis below the pivotal axis of the arm, and means including an element xed relative to the frame for shifting the position of the stop lug in accordance with turning movement of the carrier.

References Cited in the le of this patent UNITED STATES PATENTS 536,949 Fay Apr. 2, 1895 714,570 Fowler et al Nov. 25, 1902 1,500,367 Caughey July 8, 1924 1,846,652 Paul Feb. 23, 1932 2,202,931 Strandlund June 4, 1940 2,208,526 Gurries July 16, 1940 2,573,969 Heitzig Nov. 6, 1951 2,591,711 Moore Apr. 8, 1952 2,625,089 Pursche Jan. 13, 1953 2,625,090 Pursche Jan. 13, 1953 2,625,091 Pursche Jan. 13, 1953 2,633,787 Nelson Apr. 7, 1953 2,655,851 Pursche Oct. 20, 1953 2,659,284 Pursche Nov. 17, 1953 FOREIGN PATENTS 49,222 Germany of 1889 OTHER REFERENCES The Nash Century Steering Engine, pub. 1909 by Century Eng. Co., Ogdensburg, N. Y. Pages 3 and 16. Copy in 114/150. 

